Exciting dinghy for lightweight(s)

All the singlehanders I listed (except the 600) would probably be fine, each has its own ups and downs. Whilst I love sailing the 29er and 600 both in races and just blasting, I do sometimes find myself wishing I could sail the Laser again just because it was so fun to race. Sadly, there's a massive fleet at our club but none ever go out, but the few times we got a number out sailing I found the closeness of the racing really enjoyable.

Singlehanding is a different experience to doublehanding, and everyone has different preferences. I like both to an extent, while some people only like one or the other. One thing to bear in mind is that being underweight in a Laser or Byte is probably harder work than being underweight in a 29er; hiking hard on your own is a lot of work, whilst if the 29er's overpowered you can always whack on the downhaul and depower and then tell the crew to keep it flat. If you want to be really competitive then hiking's a must in everything, but it's possible to get away with sitting up a bit in the 29er and still doing quite well, but on a Laser-type boat it's hiking or losing. You're right on the bottom end of Radial weight (I think, please correct me if I'm wrong on that) and around the top half of 4.7 weight (again, can't remember the figures exactly).

Hope that's helpful, I'm sure someone will say it's a cardinal sin to stop hiking in a 29er but the main thing is to have some fun while you do it. Just have a look round, and if you can really define what you want (e.g. singlehanded hiker, doublehanded single trapeze) then you can start to narrow down.